@Override (verifies a method actually overrides a superclass/interface method, compile error if not), @Deprecated (marks an API as discouraged, warns on use), @SuppressWarnings (tells the compiler to ignore specific warnings), and @FunctionalInterface (verifies an interface has exactly one abstract method).

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#@Override#@Deprecated#@SuppressWarnings

What are some commonly used built-in Java annotations?

Why @Override Matters More Than It Looks

@Override doesn't change runtime behavior at all — its entire value is catching a very common bug at compile time: a typo'd method signature that was meant to override a parent method but instead silently declares a brand-new, unrelated method. Without it, that mistake compiles fine and just fails silently at runtime.

@Override · @Deprecated · @SuppressWarnings · @FunctionalInterface — compiler-checked built-ins

Built-in Annotations

java

class Animal {
    @Deprecated
    void oldMethod() {}

    @Override
    public String toString() { return "Animal"; }
}